Stacked intelligent metasurfaces (SIMs) and fluid antenna systems (FAS) are emerging technologies for wave-domain and spatial signal manipulation, respectively.This letter proposes a novel joint SIM-FAS communication model in which transmission and reception are performed by a SIM and an FAS, respectively. Using the block-diagonal matrix approximation (BDMA), a closed-form expression for the outage probability is derived, and the SIM phase shifts are optimized to minimize outage. Numerical results validate the analytical accuracy and demonstrate substantial performance gains over conventional benchmark schemes.

翻译：堆叠式智能超表面（SIM）与流体天线系统（FAS）分别是面向波域和空间信号处理的两种新兴技术。本文提出了一种新型联合SIM-FAS通信模型，其中发射端采用SIM进行信号处理，接收端采用FAS完成信号接收。基于块对角矩阵近似（BDMA），推导出中断概率的闭式表达式，并对SIM的相移进行优化以最小化中断概率。数值结果验证了理论分析的准确性，并表明所提方案相较于传统基准方案具有显著的性能增益。